RPC: Minor refinements on the host example doc

Change-Id: I2bd465cc857e759760103658998e68a7460c8340
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/erpc/host_example/README.rst b/erpc/host_example/README.rst
index 3c59119..3e84e67 100644
--- a/erpc/host_example/README.rst
+++ b/erpc/host_example/README.rst
@@ -13,10 +13,13 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
+
     cmake -G"Unix Makefiles" -S . -B cmake_build -DTFM_PLATFORM=musca_s1 \
-    -DCONFIG_TFM_ERPC_TEST_FRAMEWORK=ON -DTFM_PARTITION_CRYPTO=ON -DTFM_PARTITION_INTERNAL_TRUSTED_STORAGE=ON \
+    -DCONFIG_TFM_ERPC_TEST_FRAMEWORK=ON \
+    -DTFM_PARTITION_CRYPTO=ON -DTFM_PARTITION_INTERNAL_TRUSTED_STORAGE=ON \
     -DTFM_SPM_LOG_LEVEL=TFM_SPM_LOG_LEVEL_SILENCE -DTFM_PARTITION_LOG_LEVEL=TFM_PARTITION_LOG_LEVEL_SILENCE \
     -DMCUBOOT_LOG_LEVEL=OFF ../
+
     cmake --build cmake_build/ -- install -j32
 
 .. Note::
@@ -31,8 +34,12 @@
 .. code-block:: bash
 
     cd <TF-M tests base folder>/erpc/host_example
-    cmake -S . -B build -G "Unix Makefiles" -DTFM_INSTALL_PATH=<TF-M install folder> -DERPC_REPO_PATH=<eRPC base folder> \
+
+    cmake -S . -B build -G "Unix Makefiles" \
+    -DTFM_INSTALL_PATH=<TFM_build_folder>/install \
+    -DERPC_REPO_PATH=<TFM_build_folder>/lib/ext/erpc-src \
     -DERPC_TRANSPORT=UART -DPORT_NAME="/dev/ttyACM0"
+
     cmake --build  build/
 
 .. Note::
@@ -64,8 +71,11 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
+
     cmake -G"Unix Makefiles" -S . -B cmake_build -DTFM_PLATFORM=an521 \
-    -DCONFIG_TFM_ERPC_TEST_FRAMEWORK=ON -DTFM_PARTITION_CRYPTO=ON -DTFM_PARTITION_INTERNAL_TRUSTED_STORAGE=ON ../
+    -DCONFIG_TFM_ERPC_TEST_FRAMEWORK=ON \
+    -DTFM_PARTITION_CRYPTO=ON -DTFM_PARTITION_INTERNAL_TRUSTED_STORAGE=ON ../
+
     cmake --build cmake_build/ -- install -j32
 
 Build instructions on the host
@@ -74,8 +84,12 @@
 .. code-block:: bash
 
     cd <TF-M tests base folder>/erpc/host_example
-    cmake -S . -B build -G "Unix Makefiles" -DTFM_INSTALL_PATH=<TF-M install folder> -DERPC_REPO_PATH=<eRPC base folder> \
+
+    cmake -S . -B build -G "Unix Makefiles" \
+    -DTFM_INSTALL_PATH=<TFM_build_folder>/install \
+    -DERPC_REPO_PATH=<TFM_build_folder>/lib/ext/erpc-src \
     -DERPC_TRANSPORT=TCP -DERPC_HOST="0.0.0.0" -DERPC_PORT=5001
+
     cmake --build  build/
 
 .. Note::